Timer for riveters



lJuly 15,1947. B. J; YANCHENKO 2,423,920

TIMER PQR RIVETERS Filed nec. 4,l 194s s sheets-sheet 1 INVENTOR.

BASIL J. YANCH NKO ATTORNEYS July 15, 1947.

vFiled Dec. 4, 1945 5 Sheets-Sheet 2 2s H i 26 f v l2 Il I4 l .5

`42 I 36 l l? 45 3s l uw 'e se l' Il l2 SHFH dl l

FIGA

INVENTOR.

BAS". J.YANc-ENK0 uw ATTORNEYS July 15, 1947.

B. J.` YANCHENKO TIMER FOR RIVETERS Filed Dec. 4, 1943 3 Sheets-Sheet 3Il, lllllll i Flexr v INVENTOR BAS|L J.YNCHENKO B MM 17M@ TTOR NE SPatented July 15, 1947 TIMER FOR BIVETEBS man J. Yanehenko, syracuse, N.Y., assigner, by

meme assignments, to G. A. Braun, Inc., Syracuse, N. Y., a corporationof New York Application December 4, 1943, Serial No. 512,885

1 '1211s invention relates to timers i'or timing the period of operationof a pneumatic machine. or the number of operations performed by themachine upon one operation of an operating or control member or trigger,and more speciilcally for timing the number of blows delivered duringeach operation of the trigger by a riveting machine. It has for itsobject a pneumatic timer having a means which automatically closescut-out valve by a snap actionvin contradistinction to a gradual orfollow-up action after a predetermined time period or number ofoperations.

The invention consists in the,novel features and in the combinations andconstructions hereinafter set forth and claimed.

In describing this invention, reference is had to the accompanyingdrawings, in which 1ike characters designate corresponding 4parts in allthe views.

Figure 1 is a side elevation, partly in section, of a riveter equippedwith the timer.

Figure 2 is an enlarged end elevation of the timer, or a sectional viewtaken on the plane of line 22, Figure 1, parts being omitted, showingthe timer in end elevation.

Figures 3 and 4 are sectional views taken at a right angle to each otheron the planes of lines 3-1 and 4-4, respectively, Figure 2.

Figure 5 is an opposite end elevation from that shown in Figure 2, or asectional view on line 5 5, Flgurel.

Figures 6 and 'l are fragmentary sectional views similar to Figure 3 ofa riveter showing a modiiled form of the mechanism for causing the snapaction or snap closing of the cut-out valve, Figure 6 showing the snapcatch in its normal position, and Figure 7 the snap catch when pushedout by the build up of pressure to its unlocked position.

This timer comprises, generally, a body or easing having a valvecontrolled inlet for air under pressure, the valve being operated by thetrigger or operating member of the machine or riveter, to which thetimer is applied, a transfer passage leading from the valve controlledinlet passage to an outlet coupled to the air nlet passage of thepneumatic mechanism of t e machine or riveter to which the timer isapplied, a normally open cut-out valve for closing said outlet, thecut-out valve being operated to closed position by pressure from thetransfer chamber through 50 a pressure regulating valve, whereby thepressure operating to close the cut-out valve is gradually built up to apredetermined pressure and means for causing the cut-out valve to closewith a snap action, whenv that predetermined pressure is 55 reached.

I designates the pneumatic machine to which the timer is applied, thisbeing shown as a riveter having a pistol grip handle 2 and controlled bya trigger 3, the riveter having a suitable pneu- 60 matically operatedtool or head or hammer 4 operated by pneumatic means within the barrelor body i. The air is supplied to the mechanism of the riveter through ae l, here shown as extending through the pistol grip 2, the passage 5having an inlet end at 8 for coupling to a source of air. The outlet ofthe timer is coupled to this inlet passage 2. The riveter itself formsno part of this invention.

i I designates the body oi the timer, this being formed with an inletpassage I2 for coupling through a suitable conduit or hose I2 with asource of supply of compressed air, this psage i2 extending lengthwiseof the body Il and having 'a two-way or combined intake andexhaust valvei4 therein. which is self-closing, as by a spring i5. 'I'his valve isnormally arranged with its intake head closed and its exhaust head opeto permit the air to exhaust back from the tool or riveter through theexhaust passage i8 to the outer air. The intake end of this passage I2'is provided with a suitable nlter i1 carried by a plug I8 which isthreaded or formed with the coupling section for connecting acoupling-piece i8 at the end ofthe air hose to the inlet e oi the timer.The valve is operated to open position against its returning spring l5by a suitable means. as a lever 20, in the form of a yoke arrangedastride the body II and pivoted at 2| thereto. this lever being operatedby the trigger 3 through suitable means, as a push rod 22, extendinglengthwise of the pistol grip 2. The lever 20 is provided with asuitable set screw 23 which coacts with the head of a plunger- 24 guidedin a plug threading into the adjacent end of the intake passage i2, thestem thrusting against the exhaust valve head of the valve i4. A spring25 acts on the plunger 24 to retract the lever 20 and trigger 3 tonormal position, when theI trigger 40 3 is released. The valvecontrolled inlet passage i2 communicates through a transfer passage 26with the outlet 21 of the timer, this outlet being coupled at 28 to theinlet end 6 of the passage 5 m the pistoi grip z.

29 designates the cut-out valve oi the timer, this being shown as asliding piston valve located in a guide 30 and arranged to movecrosswise of the branch 3| of the transfer passage 28 toward its seat at32 at the entrance end of the outlet passage 28 of the timer. The faceof the piston valve 29 is thus exposed to pressure within the branch 3land the outlet 28 and hence the pres- Y sure tends to return the valveto open or starting position. This valve 29 is pressure-operated toclosed position by pneumatic means operated 'by air coming through abypass from the transfer passage 26 and through a pressure regulatingvalve. The pneumatic means here illustrated includes a piston 34 workingin a piston chamber or cylinder bore 35, the piston and the bore beingaxially :warumV alined with the piston valve 2l. The piston chamber onthe pressure side of the piston communicates with the transfer chamber2l throughaby-'pass' havingapressureregulating'valve 21 therein. theoutlet end of the regulating 'valve discharging into the piston chamberIl. The measure regulating valve is provided with a suitable adjustablemetering pin 22 extending to the outside of 'the casing, where it isprovided with im adjusting wheel 2l. The movement of the piston 3l bythe air building up in the piston chamber behind it through the presof areturning spring 4I.

In the form shown in Figures 3 and 4, the means for closing the cut-outvalve 2l with a snap action comprises a lost motion connection betweenthe piston u and the valve 2l. As the valve 2l and the piston 24 areaxially alined, this means is shown as a lost motion connection arrangedto be taken up when the piston 24 vhas traveled a predetermined distanceand hence pressure built up behind it to nearly the predeterminedpressure, when the motion is taken up between the piston and lthecut-out valve 2l, it is further retarded and stopped momentarily due tothe resistance offered to the closing of the valve it by the airprassure'against it. As here illustrated, the lost motion connectionbetween the piston 24 and the valve 2l is provided by a push rod 4Iextending in advance of the piston 24 and normally spaced from the rearface of the cut-out piston valve 28 and located to come into engagementtherewith, when the piston has traveled a predetermined distance and thepressure behind it built up. Now, as the motion of the piston isadditionally momentarily retarded, the pressure continues to build upthrough the pressure regulating valve to an extent whereby it overcomesthe air pressure on the face of the valve 29 presented to the air in thepassages 26, 21 and the pressure of the spring Il, and hence closes thevalve 28 with a quick or snap action. The number of operations of theriveter or the time it requires for the pressure to build up to performthis function may be adjusted by regulating the metering pin 38.

For the purpose of effecting a quick exhaust of the air from the pistonchamber 35, when the operator releases the trigger 3, a pressuresureregulating valve isagainst the resistance 'gradually toward its seat asthe pressure' to. the cut-out valve Il so that the valve I. move:l thepiston u .buuds up through tle pressure regulating valve. However, asthe cut-out valve Il approaches its seat, it encounters a springresistance which momentarily stops its movement. so that the pressurebuilds up behind the piston 2l .to an extentthat vcauses the valve BI tosuddenly overcome its spring resistance and close with a snap action.The spring resistance ls here shown as a spring-pressed poppet or ballIl located in a passage Il andA pressed into operative position by aspring 82 located between the ball and a plug 6I closing the outer endof the paage. The inner end of the passage is contracted to preventundue displacement of the ball from its seat M. The ball, however,projects beyond its seat into the path of the cut-out valve I9. When thecut-out valve 59 moves from the position shown in Figure 6 into aposition, whereby it contacts'the ball 60, the pressure builds up behindthe piston 24 to an extent whereby the pressure overcomes the resistanceof the ball 60, and also any resistance on the face of the piston valve5I, causing it to close against its seat with a snap action, and in sodoing, displacing the ball or poppet into the position shown in Figure7.

In either form of the invention, the cut-out valve is closed with a snapaction. 'I'he time for closing or the number of operations of theriveter may be varied by adjusting the metering pin y38.

The subject matter of this invention is similar to that of my pendingapplication. Serialv Number.476,976, filed February 24, 1943. Thedifference, however, is the closing of the cut-out valve with a snapaction.

What I claim is:

l. In a timer, the combination of a casing having an inlet passage for amotive fluid, and an outlet passage, the inlet passage having aself-returnf ing combined intake and exhaust control valve operatedcheck valve is provided by-passing the l pressure regulating valve, thisbeing here shown as a valve head 42 normally closed on its seat l2 inposition to close an exhaust passage 44 from the piston chamber 34, thevalve being held against its seat by a spring II. The valve 42 exv tendstransversely of the passage 3.8 and is formed with an annular groove orduct permitting the air to ilow from the transfer passage 26 aroundthevalve head I2. When, however. the operator releases the trigger I, thusclosing the intake valve Il and opening the exahust valve head thereof,the piston Il is returned to its starting position by its spring 4l,thus forcing the air through the exhaust passage 44 with lsumcientpressure to open the check valve 42, so that the air exhausts quicklyback `through the transfer chamber into the i2 and out through theexhaust port i6.

IntheformsshowninHgures6and7,thesnap action is effected by a controlledresistance instead of by a lost motion between the piston 2l and thecut-out valve 2l.

InFig1u-es`6and'I,thepushrodli thrusts' directly against. without lostmotion, or is coupled therein normally arranged with its intake closedand its exhaust open, a transfer passage between the valve and theoutlet, a normally open cut-out valve operable to close the outlet, andpressureoperated means in the timer operated by the pressure oi' Itheair in the transfer passage for controlling the last valve includingmeans for causing the cut-out to close with a snap action.

2. In a timer, the combination of a, casing having an inlet passage fora motive fluid, andan outlet passage, the inlet passage having aselfreturning combined intake and exhaust control valve therein normallyarranged with its intake closed and its-exhaust open,'a transfer passagefrom closing movement and from movement with v thepiston until thepressure through the pressure regulating valve has built up to apredetermined amount.

3. In a timer, the combination of a casing h aving an inlet passage fora motive fluid, and an outlet e, the inlet passage having aselfreturning combined intake and exhaust control valve therein normallyarranged with its intake closed and its exhaust open, a transfer passagebetween the valve and the outlet, a normally open cut-out valve operableto close the outlet, a pressure-operated member, means between it andthe cut-out valve for transmitting the movement of said mem-ber to thecut-out valve, to close the cut-out valve, a pressure regulating valveto control the flow of motive fluid to the pressure-operated member, thecut-out valve having a pressure face located so that the pressure of theair passing the open cut-out valve' tends to hold it open, and means fordelaying the closing movement of the cut-out valve until the pressurethrough the pressure regulating valve has built up to a predeterminedamount, the delaying means including a lost motion connection betweenthe pressure-operated member and the control valve.

4. In a timer, the combination of a casing having an inlet passage for amotive uid, and an outlet passage, the inlet passage having aselfreturning combined intake and exhaust control valve therein normallyarranged with its intake closed and its exhaust open, a transfer passagebetween the valve and the outlet, a normally open cut-out valve arrangedin position to, when operated, close the outlet and having a facepresented to the pressure of fluid in the outlet, a piston chamber, apiston in the chamber, a by-pass connecting the transfer passage and thepiston chamber on the pressure side of the piston and having a pressureregulating valve therein, means for yieldingly restraining the movementof the piston by the air pressure passing through the by-pass, and meansfor transmitting the motion of the piston to the cut-out valve causingthe closing of the cut-out valve by the piston to be momentarily delayedand held from movement with the piston until the pressure in the pistonchamber through the bypass has built up to a predetermined amount.

5. iIn a timer, the combination of a casing having an inlet passage fora motive fluid, and an outlet passage, the inlet passage having aselfreturning combined intake and exhaust control valve therein normallyarranged with its intake closed and its exhaust open, a transfer passagebetween the valve and the outlet, a normally open cut-out valve arrangedin position to, when operated, close the outlet and having a facepresented to the pressure of fluid in the outlet, a piston chamber, apiston in the chamber, means for transferring the movement of the pistonto the cut-out valve including a lost motion connection permitting thepiston to be moved by the air pressure relative to the cut-out valvebefore the lost motion is taken up, a by-pass connecting the transferpassage and the piston chamber on the pressure side of the piston andhaving a pressure regulating valve therein, and means for yieldinglyrestraining the movement of the piston by the air pressure passingthrough the by-pass.

6. In a timer, the combination of a casinghavlng an inlet passage for amotive fluid, and an outlet passage, the inlet passage having aselfreturning combined intake and exhaust control valve therein normallyarranged with its intake closed and its exhaust open, a transfer passagebetween the valve and the outlet, a normally open cut-out valve arrangedin position to, when operated, clese the outlet and having a facepresented to the pressure of uuid in the outlet, a piston chamber, apiston in the chamber having pass connecting the transfer passage andthe piston chamber on the pressure side of the piston and having apressure regulating valve therein, means for retarding the movement ofthe piston by the air pressure passing through the by-pass, the pistonbeing connected to the cut-out valve to press against the same as theair pressure builds up behind the piston chamber and a snap restrainingdevice for holding the cut-out valve for movement until a predeterminedpressure is built up behind the piston.

7. In a timer, the combination of a casing having an inlet passage for amotive fluid, and an outlet passage, the inlet passage having aselfreturning combined intake and exhaust control valve therein normallyarranged with its intake closed and its exhaust open, a transfer passagebetween the valve and the outlet, a normally open cut-out valve arrangedin position to, when operated, close the outlet and having a faceypresented to the pressure of fluid in the outlet, a piston chamber, apiston in the chamber having a rod operable to close the cut-out valve,a bypass connecting the transfer passage and the piston chamber on thepressure side of the piston and having a pressure regulating valvetherein, means for retarding the movement of the piston 'by the airpressure passing through the bypass, the piston being connected to thecut-out valve to press against the same as the air pressure builds upbehind the piston chamber, and a snap restraining device for holding thecut-out valve from movement until la predetermined pressure is built upbehind the piston, said device being arranged to coact with the cut-outvalve when the piston approaches the end of its throw.

8. In a timer, the combination of a casing having an inlet passage for amotive fluid, and an outlet passage, the inlet passage having aselfreturning combined intake and exhaust control valve therein normallyarranged with its intake closed and its exhaust open, a transfer passagebetween the valve and the outlet, a normally open cut-out valve operableto close the outlet, pressure-operated means in the timer operated bythe pressure of the air in the transfer passage for controlling the lastvalve including means for causing the cut-out valve to close with a snapaction, means operable on the pressure-'operated means to return saidmeans to starting position when the pressure therein is released, and anexhaust valve for the pressure-operated means opened by the pressure ofthe returning means a rod operable to close the cut-out valve, a bywhenthe control valve `is returned to normal position.

BASIL J. YANCHENKO.

REFERENCES CITED The following references are of record in the ille ofthis patent:

UNITED STATES PATENTS Number Name Date 2,067,064 Platz Jan. 5, 19371,956,962' Ringle May 1,v 1934 1,801,069 Boker Apr. 14, 1931 FOREIGNPATENTS Number Country Date 689 Great Britain ----1 1870

